Rewind machine

ABSTRACT

A roller rewind machine having at least one moveable winding shaft for receiving a plurality of winding rollers and contact rollers disposed on a carrier axis and coupled to each winding roller including a plurality of prestressed eccentric rings mounted in circumferential direction on the carrier axes which is pivotably supported in a receiving means of the machine. The outer surfaces of the eccentric rings pivotably support the contact rollers in a freely rotatable manner. Springs are used to prestress each eccentric ring. The tension and thus the feed pressure of the contact rollers can be adjusted against the winding rollers while the machine is operating.

United States Patent [1 1 Kampf et al.

[ Oct. 28, 1975 REWIND MACHINE [73] Assignee: Firma Erwin KampfMaschinenfabrik, Wiehl, Germany 22 Filed: Aug. 19, 1974 21 Appl. No.:498,351

[58] Field of Search 242/56.2, 56.4, 56.5, 56.9, 242/65, 66, 34

[5 6] References Cited UNITED STATES PATENTS 5/1961 Rockstrom et al.242/65 3,591,101 7/1971 Gallet et al. 242/56.2 3,702,687 11/1972 Hal]3,712,554 l/l973 Lorenzini et al 242/56.2

Primary ExaminerLeonard D. Christian Attorney, Agent, or Firm-Allison C.Collard [5 7] ABSTRACT A roller rewind machine having at least onemoveable winding shaft for receiving a plurality of winding rollers andcontact rollers disposed on a carrier axis and coupled to each windingroller including a plurality of prestressed eccentric rings mounted incircumferential direction on the carrier axes which is pivotablysupported in a receiving means of the machine. The outer surfaces of theeccentric rings pivotably support the contact rollers in a freelyrotatable manner. Springs are used to prestress each eccentric ring. Thetension and thus the feed pressure of the contact rollers can beadjusted against the winding rollers while the machine is operating.

7 Claims, 4 Drawing Figures US. Patent Oct. 28, 1975 Sheet 1 of33,915,404

FIG]

US. Patent Oct. 28, 1975 Sheet 2 of3 3,915,404

U.S. Patent Oct.28, 1975 Sheet30f3 3,915,404

FIGA

REWIND MACHINE This invention relates to a roller rewind machine havingat least one moveable winding shaft for receiving a plurality of rewindrollers, as well as contact rollers for each rewind roller.

A roller rewinding machine of this type is used for winding longitudinalcut strips of web or foil material. In many cases, the roller rewindingmachine is combined with a roller cutting machine. The cut strips ofwebs adjoining each other are alternately wound onto different windingshafts. Normally, the material is of a non-uniform caliber or thicknessthroughout the length and the width of the web so that some of therewind rollers tend to have a larger diameter than other adjacentrollers when rwound on the same rewind shaft. To assure that the contactrollers may be pivoted independently from the others, and pressedagainst the rewind roller, individually mounted swing arms are providedfor each contact roller. Such a construction of a roller rewindingmachine is rather expensive, and requires a great deal of readjustmenttime if and when webs of different widths have to be cut and rewound.

It is therefore an object of the present invention'to provide a rollerrewind machine comprising at least one moveable rewind shaft forreceiving a plurality of rewind rollers, and a carrier axis mounted inthe receiving means of the machine frame and bearing a plurality ofcontact rollers each in contact with one rewind roller. Each contactroller is supported in a freely rotatable manner on the outer surface ofan eccentric ring. An eccentric inner surface of each eccentric ring ismounted in a rotatable manner on the carrier axis and each eccentricring is prestressed in the circumferential direction of the carrieraxis. The prestressed eccentric rings assure that each individualcontact roller is moveable radially with respect to the winding shaft,and independently from the other contact rollers, so that each contactroller automatically engages its associated rewind roller. The contactpressure of the contact roller remains substantially constant, becausethe displacement of the eccentric rings require only a slight change inthe pressure of the contact roller against the rewind roller.

In accordance with the invention, a helical bending spring prestresseseach individual eccentric ring with respect to the jacket of the carrieraxis. Thereby each contact roller is individually pressed against itsassociated rewind roller. To assure that each contact roller may beeasily adjusted in an axial direction, it is preferable that eacheccentric ring be mounted on a carrier ring which is adjustablydisplaceable on the carrier axis, and which may be clamped at thedesired place so that this carrier ring is rotatable and that a tensionspring is mounted between the carrier ring and the eccentric ring. Inorder to adjust the pre-tension for the eccentric rings, the jacket ofthe carrier axis is rotatably and adjustably mounted in the receivingmeans of the machine frame.

In order to permit a fast readjustment of this pretension, even duringthe operation of the machine, the invention provides a worm gear carriedin the jacket of the carrier axis, and engaged by a worm which in turnis adjusted by an adjustment shaft. Finally, the invention provides anabutment rod between the receiving means parallel with respect to thecenter line of the carrier axis, so as to limit the pivotal movement ofthe eccentric rings to a desired angular range. The eccentric rings areprovided with a curved slot which runs concentrically with respect tothe inner surface of the eccentric rings, and beyond the abutment rod.

Other objects and features of the present invention will become apparentfrom the following detailed description when taken in connection withthe accompanying drawings which disclose several embodiments of theinvention. It is to be understood that the drawings are designed for thepurposes of illustration only, and are not intended as a definition ofthe limits and scope of the invention disclosed.

In the drawings wherein similar reference numerals denote similarelements throughout the several views:

FIG. 1 is a plan view of a roll cutter and winding machine;

FIG. 2 is a view shows a cross section of the machine of FIG. 1;

FIG. 3 is an enlarged cross-sectional view of the carrier axis and thefeed roll; and

FIG. 4 is a cross-sectional view along line IV-IV of FIG. 3.

Referring to FIGS. 1 and 2, two guide paths 2 for carriers 3 for tworewind shafts 4 are mounted in a machine frame I. Adjustment spindles 5which are driven by a motor 6, move carriers 3. Receiving means 7 aremounted on bearing plates 41 to receive carrier axis 8, on which aplurality of contact rollers 9 are rotatably mounted. The machinecontains a cutting shaft 10 and a counter cutting shaft 11. Furthermore,a plurality of guide and return rollers 12 are provided for the web 13or the cut strips 14, which have to be wound onto rewind rollers 16. Aguide roller 15 is associated with each contact roller 9 in such amanner that the strip of material in the range of the contact line movessubstantially tangential with respect to rewind roller 16. Thereby thecontact roller 9 is relieved from the pull tension of the strip ofmaterial, and works exclusively as the contact roller for the strip ofmaterial and not as a return' roller. A drive motor 17 drives thecutting device and transport rollers by any suitable means such as forexample, drive belts or the like. A motor 18 is associated with each ofthe winding shafts 4.

FIGS. 3 and 4 show in an enlarged scale, carn'er axis 8 together withcontact rollers 9. A clamping rod 19 is retained in the receiving means7, so that the end portion of carrier axis 8 is secured on clamping rod19. A tubular jacket 20 of the carrier axis is rotatably mounted onclamping rods 19 and mounted in glide or roller bearings. A worm wheel21 is mounted on one end of jacket 20, so that worm wheel 21 engages aworm gear 22 which is mounted on an adjustment shaft 23 (FIG. 1). Thisadjustment shaft is connected with an adjustment wheel 42 which ismounted at the front surface of machine frame 1. A wedge groove 25 runsalong the axis length of jacket 20. A carrier ring 26 engages wedgegroove 25 with a wedge 27, and may be clamped into the wedge groove by aclamp screw. An eccentric ring 29 is rotatably mounted on carrier ring26, so that the inner surface 30 of the eccentric ring runsconcentrically with respect to the center line 31 of carrier axis 8. Thecenter line 33 of the outer surface 32 is offset with respect to centerline 31 of inner surface 30, as can be seen from FIGS. 3 and 4. Ahelical spring 34 is tensioned between a shoulder 35 of carrier ring 26and in a passage 36 of eccentric ring 29, so that a tension incircumferential direction may be obtained. The

FIG. 4 shows schematically the circumferential curve 39 of rewind roller16. Carrier axis 8 may receive a plurality of contact rollers 9,corresponding to the number of rewind rollers 16 mounted on rewind shaft4. The contact rollers, as already mentioned, are adjustable in axialdirection, so that they may be rapidly and precisely adjusted to therespective rewind roller. This means a relatively short readjustmenttime for the machine.

The pretension and the feeding pressure of the contact rollers isadjusted by turning jacket 20 by means of worm gear 22. In the positionshown in FIGS. 3 and 4, jacket 20 together with carrier ring 26 areturned in the direction of arrow 40, so as to increase the contactpressure. The pivotal movement of the eccentric rings 29 is limited bycurved slot 37, so that the eccentric rings cannot accidentally turnover.

By means of adjustment wheel 42, the associated jacket 20 of carrieraxis 8 is adjusted so that the tension springs 34 create the desiredcontact pressure. All contact rollers bear with the same contactpressure against the associated rewind rollers 16. Each individualcontact roller can swing independently due to the associated eccentricring 29. The circumferential line 39 is scanned by a light barrier (notshown). As a result of this, signal motor 6, for adjustment spindles iscontrolled, so that carriers 3 are moved accordingly.

While only a few embodiments of the present invention have been shownand described, it will be obvious to those skilled in the art that manychanges and modifications may be made thereunto without departing fromthe spirit and scope of the invention.

What is claimed is: A

1. A roller rewind machine comprising a machine frame bearing at leastone moveable rewind shaft for receiving a plurality of rewind rollersand further bearing a receiving means carrying a carrier axis, aplurality of eccentric rings each supporting a contact roller in contactwith one rewind roller, an eccentric inner surface of each eccentricring being mounted in a rotatable manner on said carrier axis and eacheccentric ring being prestressed in circumferential direction of saidcarrier axis.

2. The roller rewind machine according to claim 1 comprising a bendingspring prestressing each eccentric ring with respect to the carrieraxis.

3. The roller rewind machine according to claim 2 comprising a carrierring for rotatably mounting each eccentric ring, said carrier ring beingadjustably displaceable on the carrier axis in an axial direction, andsaid bending spring being mounted between said carrier ring and saideccentric ring.

4. The roller rewinding machine according to claim 3 wherein thecarrienaxis includes a tubular jacket rotatably and adjustably mountedin the receiving means of the machine frame and supporting said carrierring.

5. The roller rewinding machine according to claim 4 wherein saidtubular jacket includes a worm wheel disposed on its circumference, aworm gear engaging the worm wheel, and an adjustment shaft for actuatingthe worm gear.

6. The roller rewinding machine according to claim 5 comprising anabutment rod disposed between the receiving means of the machine frameparallel with respect to the carrier axis for limiting the pivotalmovement of said eccentric rings to a desired angle or setting, saideccentric rings being provided with a curved slot disposedconcentrically with respect to the inner surface of the eccentric ringsand receiving the abutment rod.

7. The rewinding machine according to claim 1 comprising a guide rolleris associated with each of the contact rollers so that a strip ofmaterial in the range of the contact line moves substantially tangentialwith respect to the winding rollers.

1. A roller rewind machine comprising a machine frame bearing at leastone moveable rewind shaft for receiving a plurality of rewind rollersand further bearing a receiving means carrying a carrier axis, aplurality of eccentric rings each supporting a contact roller in contactwith one rewind roller, an eccentric inner surface of each eccentricring being mounted in a rotatable manner on said carrier axis and eacheccentric ring being prestressed in circumferential direction of saidcarrier axis.
 2. The roller rewind machine according to claim 1comprising a bending spring prestressing each eccentric ring withrespect to the carrier axis.
 3. The roller rewind machine according toclaim 2 comprising a carrier ring for rotatably mounting each eccentricring, said carrier ring being adjustably displaceable on the carrieraxis in an axial direction, and said bending spring being mountedbetween said carrier ring and said eccentric ring.
 4. The rollerrewinding machine according to claim 3 wherein the carrier axis includesa tubular jacket rotatably and adjustably mounted in the receiving meansof the machine frame and supporting said carrier ring.
 5. The rollerrewinding machine according to claim 4 wherein said tubular jacketincludes a worm wheel disposed on its circumference, a worm gearengaging the worm wheel, and an adjustment shaft for actuating the wormgear.
 6. The roller rewinding machine according to claim 5 comprising anabutment rod disposed between the receiving means of the machine frameparallel with respect to the carrier axis for limitinG the pivotalmovement of said eccentric rings to a desired angle or setting, saideccentric rings being provided with a curved slot disposedconcentrically with respect to the inner surface of the eccentric ringsand receiving the abutment rod.
 7. The rewinding machine according toclaim 1 comprising a guide roller is associated with each of the contactrollers so that a strip of material in the range of the contact linemoves substantially tangential with respect to the winding rollers.